US1373002A

US1373002A - Dynamo-electric machine

Info

Publication number: US1373002A
Application number: US97837A
Authority: US
Inventors: Rudolf E Hellmund
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1916-05-16
Filing date: 1916-05-16
Publication date: 1921-03-29
Anticipated expiration: 1938-03-29

Description

n. E. HELLMUND.

DYNAMO ELECTRIC MACHINE.

APPLlcATvloN FILED MAY1s,191e.

' WITNESSESZ Riga/f E. He//mwrd C l i MTQRNEYy DYNAMO-ELECTRIC MACHINE Specification of Letters Patent.

Patented Mar. 29, 1921.

Application ledvMay 16, 1916. Serial No. 97,837.

To all whomk t 'may concern.'

Be it known that I, RUDOLF E. HELL- MITND, a subject of the German Emperor, and a resident of Swissvale, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dynamo -Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines, and it has particular relation to systems of ventilation for such machines.

ne object of my invention is to provide an improved 'system of forced ventilation for motors of the semi-inclosed type that will insure uniform distribution of the cooling medium throughout the motor..

A further object of my inventlon 1s to provide a system of ventilation that may be advantageously applied to motors which are arranged to operate in pairs.

It has heretofore been proposed to provide the relatively rotatable core members of dynamo-electric machines with longitudinal ducts for the passage of a cooling air. owever, when an external source was employed to create a circulation of the air, it was found that a greater volume of air passed through the ducts in the stationary member than through the ducts in the rotating member. This resulted in undue heating of the latter member. By my invention, I provide means for guiding and forcing the air through the ducts in the rotatable member.

In the accompanying drawing, the figure is a transverse sectional view of a motor embodying my invention, and comprises substantially semi-annular plates 1 and 2 between which is clamped a curved frame 3. An annular magnetizable core member 4 is composed of laminations and is secured between annular eud-plates 5 that are of somewhat greater outside diameter than the laminations. The core member 4 is positioned on the frame 3 by spaced projections 6 provided on the inner surface thereof which ft between the end-plates. The member 4 and the plates 5 are provided with longitudinal passages 7, and additional longitudinal passages 8 are provided by the spaces between the projections 6 and the outer surface of the core member 4. The frame 3 is provided with an opening 9 that s located adjacent to the left-hand end plate 5. A second annular magnetizable core member 10 is composed of laminations and 1s secured between end-plates 11 that are mounted on a spider 12. The spider 12 is keyed to a shaft 13 that is rotatably mounted in bearings 14 which are supported by the plates 1 and 2, respectively. The core member 10 and the end-plates 11 are provided with longitudinal passages 15. Additional longitudinal passages 15 are provlded between the web 12a of the spider 12 and the inner surface of the core member 10. A winding 16 is located in suitable slots in the core member 10, and the end portions of the coils comprising the winding 16 are braced by an annular support 17. The coil-support 17 has an inner curved surface. and circular plates 18, having curved surfaces similar to the inner surface of the support 17. are secured to the end plate 11 at points intermediate the passages 15. Substantially concentric passages 19 that bend toward the shaft 13 are thus provided between the plates 18 and the member 17. The plates 18 are respectively provided along their inner edges with vanes 2O that project into the passages 19.

A casing 22. preferably formed ofsheet metal. incloses the upper portions of the motor.v The top plate 23 of the casing 22is supported by the end-plates 5 of the core member 4, thus providing closed passages 24 between the outer surfaces members 4 and the casing 22. plates 25 of the casing 22 are supported by t e bearings 14 and are spaced from the ends of the winding 16 to provide

chambers

26 and 27. opening 28 is provided at thetop of the chamber 26 at a point directly above the axis of the motor. The opening 28 is connected to suitable external means for creating a circulation of air, such as fans 30. by means of tubes 31.

Having fully described the various parts of my device, the action of the ventilating system during the operation of the motors is as follows: When the fans 30 are operated. airis forced into the chamber 26 and a portion thereof passes through the longitudinal passages 7 and 8 of the core member 4. The remainder of the air is delivered to the passages 19 where the rotation of the vanes 20 carried by the core member 10. actin in conjunction with the plates 18, sets the air into rotation and forces it into the curved passages 19 at a slightly increased 'pressure and through the longitudinal passages 15. The air is discharged from the longitudinal passages 15 into a collecting chamber and passes outside of che frame 3 through the opening 9.

It is apparent from the foregoing that the Ventilating air is equally distributed Within the motors and that continuous passage of the air through the rotating member is insured by the presence of the guiding passages and vanes.

. I'Vhile I have shown my invention in a simple and preferred form, it is not so limited but is capable of various minor changes and modifications Within the scope of the appended claims.

I claim as my invention:

1. In a. dynamo-electric machine, the combination With relatively rotatable magnetizable members provided with longitudinal passages, and an inclosing casing for said members, of external means for creating a circulation of air through said machine, and further means located Within said casing for setting the air into rotation and for slightly raising the pressure thereof before entering the passages in the rotatable member.

2. In a dynamo-electric machine, the combination With relatively rotatable magnetizable members provided with longitudinal passages, and an inclosing casing for said member, of external means for creating a circulation of air through said machine and vanes carried by the rotatable member and coacting barrier members for setting the air Within said casing into rotation and for slightly raising the pressure thereof before entering the passages in said rotatable member. v

In testimony whereof I have hereunto subscribed my name this 29th day of April, 1916.

RDOLF E. HELLMUND.